chore: bump local version of bazel used to 4.2.0

[mattem]

This bumps the version of bazel used locally when building to 4.2.0. This version is the first bazel version in 4.x that supports M1 correctly.
This bump doesn't change what is expected from users. However, should it?

[alexeagle]

Let's go to 4.2.2 and also update version.bzl ?

[thundergolfer]

@mattem

However, should it?

Yeh the version.bzl says as much, originally written by Alex 🙂

# This version should be updated together with the version of the Bazel
# in .bazelversion.

(we can delete that last "the" in the first line)

[mattem]

Yeah, I'm familiar with the semantics (and the typo) from rnj, my question was more do we want to now bump the minimum supported version for rules_python to 4.2.2, or do we want to test against an array of versions (which will be slower on CI here). Sounds like the consensus is to bump it.